Add the apple slices to pan over medium heat and stir in the spices, lemon juice, and sugar. Heat until some of the juices release and the apples begin to soften slightly.
3 large baking apples, 2 teaspoons ground cinnamon, ¼ teaspoon ground nutmeg, ¼ teaspoon ground cloves, 2 tablespoons lemon juice, ¼ cup light brown sugar
Mix together the cornstarch and water, then add to the apples and stir immediately.
1 tablespoon corn starch, ¼ cup water
Once thickened, remove from the heat, stir in the vanilla, then transfer to a plate to cool for about 15 minutes, stirring every few minutes to release steam.
1 teaspoon vanilla paste or extract
Preheat the oven to 400℉/205℃ and line a baking sheet with parchment paper.
Lightly roll out puff pastry to ⅛” thick. Use a pizza cutter or knife to cut off the tips of the corners all the way around to form a slight circle. Transfer it to the prepared pan.
1 sheet puff pastry
Add the apple pie filling to the center (piling it higher in the center), leaving 2 inches around the edges.
Add egg wash to the insides of the pastry around the apples, then fold the edges upward in sections. Freeze the galette for 15 mins.
1 egg
Brush egg wash onto the pastry (taking care not to get the very edges or else it can seal the layers). Sprinkle generously with coarse sugar.
coarse sugar
Bake for 20-25 mins until deeply golden brown. Cool for 5 minutes, then slice & serve with ice cream or whipped cream.